The easiest way to get this achievement is on "Diamond Store", as there are always 4 guards and the routine to stealth it is pretty easy!
Just don't forget to kill all the 4 guards within 90 seconds. If you manage to kill them with shurikens, you'll also be rewarded with this achievement:
The Shuriken Shenanigans achievement in PAYDAY 2 worth 21 pointsComplete a single day of a heist in stealth using only the Shuriken throwable and killing at least 4 enemies. Unlocks the "Kuro Zukin" mask, "Bamboo" material and "Koi" pattern.
Here is a video from GeneralMcBadass to show you the easiest way to stealth this map :